This is the second attempt, the first attempt is below. I really like how this turned out, not sure if Kia is planning a wagon of the K5/Optima again but if they used the current Optima wagon's rear end, it would look quite good.
The first version I did is above, I feel it looks a bit too short but overall, I feel it looks good as well. The bumper seems to be different here and I do prefer this bumper design than the one in the other render. Please do not crop. Enjoy.